This comic is even goofier than the typical melodrama plots the touhou series sees.
"Our friend is losing her powers, what do we do? Should we get together with all our cosmic godmodding powers and restore her?" "No, let's breed her like livestock then throw her away like a used condom for the sake of drama." "Brilliant!"
Yeah... that makes about as much sense as the usual h-manga plot, just with eros replaced with thanatos.